Water temperature in Portsmouth (NH) in February
Is it warm enough to swim in Portsmouth in February? Average water temperature in Portsmouth in February is 39.4°F and therefore is not suitable for comfortable swimming. The warmest sea in Portsmouth in February is 43.2°F, and the coldest is 35.2°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Portsmouth
Changes water temperature in Portsmouth in February 2026, 2025
To get an accurate forecast for the water temperature in Portsmouth for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Portsmouth, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of February.
You can choose any other years:
| Day | 2026 | 2025 | Min | Max |
|---|---|---|---|---|
| February 1 | 38.3°F | 40.1°F | 38.3°F | 43.2°F |
| February 2 | 37.9°F | 39.6°F | 37.9°F | 42.8°F |
| February 3 | 38.7°F | 39.9°F | 38.3°F | 42.6°F |
| February 4 | 37.6°F | 39.7°F | 37.6°F | 42.1°F |
| February 5 | 37°F | 39°F | 37°F | 42.3°F |
| February 6 | 38.5°F | 38.7°F | 37.8°F | 42.3°F |
| February 7 | 39°F | 38.8°F | 37.8°F | 42.4°F |
| February 8 | 38.5°F | 38.8°F | 37.6°F | 42.1°F |
| February 9 | 38.1°F | 38.7°F | 37°F | 42.1°F |
| February 10 | 37.6°F | 37.9°F | 36.5°F | 41.9°F |
| February 11 | 36.5°F | 38.5°F | 36.5°F | 41.7°F |
| February 12 | 36.9°F | 38.1°F | 36.9°F | 41.4°F |
| February 13 | 38.3°F | 38.1°F | 36.9°F | 41.2°F |
| February 14 | 38.5°F | 37.9°F | 37°F | 42.1°F |
| February 15 | 37.6°F | 39°F | 36°F | 41.7°F |
| Day | 2026 | 2025 | Min | Max |
|---|---|---|---|---|
| February 16 | 37.8°F | 39.2°F | 36.1°F | 42.6°F |
| February 17 | 37.8°F | 38.5°F | 36.5°F | 42.6°F |
| February 18 | 37.2°F | 37.9°F | 36.3°F | 41.5°F |
| February 19 | 37.8°F | 38.1°F | 36°F | 41.5°F |
| February 20 | 38.3°F | 38.7°F | 36.5°F | 41.7°F |
| February 21 | 38.5°F | 37.6°F | 36°F | 41.4°F |
| February 22 | 38.7°F | 37.6°F | 36.1°F | 41.5°F |
| February 23 | 38.1°F | 38.1°F | 35.4°F | 41.5°F |
| February 24 | 37.2°F | 38.1°F | 35.8°F | 41.7°F |
| February 25 | 37.8°F | 38.8°F | 35.2°F | 41.5°F |
| February 26 | 36.5°F | 37.9°F | 35.6°F | 41.4°F |
| February 27 | 37°F | 37.9°F | 35.4°F | 41°F |
| February 28 | 36.9°F | 38.3°F | 35.8°F | 41.2°F |
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Average water temperature in Portsmouth in February over a decade
| 2017 | 2018 | 2019 | 2020 | 2021 |
| 41.2°F | 39.6°F | 38.7°F | 39.6°F | 39.6°F |
| 2022 | 2023 | 2024 | 2025 | 2026 |
| 39.9°F | 41.4°F | 39°F | 38.5°F |
Portsmouth sea state in February
Chart comparing the height of waves in Portsmouth in February over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.
Portsmouth water temperature during other months:
You can also view information about water temperature for other months by clicking on the month button below
